MULTICLONES QUANTUM CLONING OF QUTRITS
Wen‐Hai Zhang, Dai Jie-lin, Zhuo‐Liang Cao, Ming Yang · International Journal of Quantum Information · 2010
In this paper, we present the explicit transformations of the optimal 1 → 3 universal quantum and the phase-covariant cloning in 3 dimensions (qutrits). The fidelities of two types of cloners reach the theoretical bounds.